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Sometimes during trasport it is possible that styrofoam float mechanicaly activated overflow microswitch. So, you should check complitely overflow system.

At any time, if overflow micro-switch act and keep for longer than 2 seconds, the E4 would occur. When E4 occurs, the drain pump will run until flowmeter keep motionless for 2 minutes (if the model with the pressure switch (83/63),drain pump would run till the pressure switch reset and continue draining for 60 seconds.) and all the other components will be stopped immediately. At the same time, the buzzer will alarm for 30 seconds and error 4 will be shown. Note: Priority level of E4 is the highest. E4 operation is valid after other error operations have done. When E4 operation has done, all the others are invalid.

E4 error indicate an abnormal water level which means too much inlet water (E5 also is refer at this fault).

I quote other comments/solution about this same error:-----------------------------------------------------------------------------------------------------------------------------------------------------I had the e4 error code and i took the outer panel off and inside behind
the power button is a grey reservoir tank which measures the water that
goes inside the dishwasher which actually got bunged up with **** and
grease causing the floaty thing to get jammed and cause the e4 code to
come on which means abnormal water level the top to the reservoir just
unclips on both sides then just clean all the gooey stuff out and put it
back together it worked for me.-----------------------------------------------------------------------------------------------------------------------------------------------------

1.Low water pressure — check for clogged hose strainer; check that site water pressure meets minimum flow pressures.2.Make sure probes are clean.3.No water pressure — main water supply valves may not be working.4.Drain valve open - turn machine off to drain machine, then on. Repeat twice (this assists in clearing any drain valve obstructions). Wait for machine to reach READY mode and press WASH. Slowly open door several seconds later and note water level. Close door; 30 seconds later, open door slowly and check that water level is the same as it was. If not, repeat theOFF-ON procedure.5. Delime machine.

This might be a re-badged generic dishwasher - on my Baumatic E4 error caused by floatswitch in bottom catch tray. Some (supposedly small amount) water collects here and should evaporate naturally. If it accumulates, float rises and stops machine.

TURN OFF THE POWER

try to find a way into the machine base catch-tray to sponge it out - on the Baumatic there are two large black plastic plugs on the front of the machine base that can be forcibly flipped out.

The instruction manual defines E4 as "overfilled", a possible reason being too much inlet water. What helped with our machine - removed all dishes inside, then let the machine's pump run briefly to make sure as much water was drained from the system as possible. I then unplugged the device, placed a large towel on the floor around its base, and tilted the machine front-ward, until all water had run out. Lifted the machine back upright, plugged it in, switched on - and voilà! it's working as I speak.